21. How would you rank the following in decreasing order of reactivity toward nucleophilic aromatic substitution? (most reactive on left)5d5e03643f620.jpg
(A) 4 ＞ 1 ＞ 3 ＞ 2
(B) 2 ＞ 3 ＞ 1 ＞ 4
(C) 3 ＞ 2 ＞ 4 ＞ 1
(D) 1 ＞ 3 ＞ 2 ＞ 4
(E) impossible to predict

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統計： A(0), B(6), C(0), D(0), E(1) #2055438